package chen;

import chen.toolbean.MyTools;
import chen.valuebean.GoodsSingle;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet(name = "DoCarServlet", urlPatterns = {"/Docar"})
public class DoCarServlet extends HttpServlet {
    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException 
 {  
    HttpSession session = request.getSession();
    chen.toolbean.ShopCar myCar;
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {
    /* TODO output your page here. You may use following sample code. */
    out.println("<!DOCTYPE html>");
    out.println("<html>");
    out.println("<head>");
    out.println("<title>Servlet DoCarServlet</title>");            
    out.println("</head>");
    out.println("<body>");  
    synchronized (session) {
    myCar = (chen.toolbean.ShopCar)session.getAttribute("myCar");
    if (myCar == null)
    {
      myCar = new chen.toolbean.ShopCar();
      session.setAttribute("myCar", myCar);
    }
  }
   out.write('\n');
   String action=request.getParameter("action");
   if(action==null)
	action="";	
   if(action.equals("buy")){									//购买商品
        ArrayList goodslist=(ArrayList)session.getAttribute("goodslist");	
        int id=MyTools.strToint(request.getParameter("id"));		
        GoodsSingle single=(GoodsSingle)goodslist.get(id);
        myCar.addItem(single);//调用ShopCar类中的addItem()方法添加商品
        response.sendRedirect("Shopcar.xhtml");		
     } else if(action.equals("add")){
        ArrayList goodslist=(ArrayList)session.getAttribute("goodslist");	
        int id=MyTools.strToint(request.getParameter("id"));		
        GoodsSingle single=(GoodsSingle)goodslist.get(id);
        myCar.addItem(single);//调用ShopCar类中的addItem()方法添加商品
        response.sendRedirect("Show.xhtml");	
      } else if(action.equals("add2")){
           String name=request.getParameter("name");
          ArrayList goodslist=(ArrayList)session.getAttribute("goodslist");
          for(int i = 0; i < goodslist.size();++i){
              GoodsSingle temp=(GoodsSingle)goodslist.get(i);  
              if(temp.getName().equals(name)){
                  myCar.addItem(temp);
              }
          }
          response.sendRedirect("Shopcar.xhtml");
     } else if(action.equals("remove")) {	
         //移除商品
        String name=request.getParameter("name");
        myCar.removeItem(name);	//调用ShopCar类中的removeItem()方法移除商品
        response.sendRedirect("Shopcar.xhtml");		
    } else if(action.equals("clear")){							//清空购物车
        myCar.clearCar();//调用ShopCar类中的clearCar()方法清空购物车
        response.sendRedirect("Shopcar.xhtml");
    }
    else{
        response.sendRedirect("Show.xhtml");		
    }	

    out.println("</body>");
    out.println("</html>");
   }
 }
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
